| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1323075 | Journal of Organometallic Chemistry | 2016 | 8 Pages |
•Three new azo-containing Schiff Bases and their Ru (II) complexes were synthesized.•The complexes were performed as catalysts for the transfer hydrogenation.•It was observed that azo group has got remarkably increasing effect on the catalytic activity.•Best active catalyst has found to be complex 5.
New Schiff base ligands including azo group such as (4-((E)-(4-ethylphenyl)diazenyl)-2-((E)-(phenylimino)methyl)phenol 2, 4-((E)-(4-ethylphenyl)diazenyl)-2-((E)-(naphthalen-1-ylimino)methyl)phenol 3, 2-((E)-(benzylimino)methyl)-4-((E)-(4-ethylphenyl)diazenyl)phenol 4 and azo group-free ligand (E)-2-((benzylimino)methyl)phenol 8 and their ruthenium complexes 5–7 and 9 with [RuCl2(p-cymene)] were synthesized and characterized by spectroscopic techniques including 1H and 13C NMR, FT-IR and UV–Vis. According to the UV–visible, IR and NMR data, the Ru (II) complexes 5–7 and 9 are formed by the coordination of N, O atoms of the ligands. Molecular structures of the complex 7 and complex 9 were determined by single crystal X-ray diffraction studies. These Ruthenium (II) complexes 5–7 and 9 were used as catalysts for the transfer hydrogenation of a series of ketones and benzaldehyde in 2-propanol. Following the comparison of complex 9 with the other three azo containing complexes 5–7, it was observed that azo group has got remarkable increasing effect on the catalytic activity. The results showed that the complex 5 is efficient than the other Ru (II) complexes.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
